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javascript Programming Glossary: doHow do JavaScript closures work? http://stackoverflow.com/questions/111102/how-do-javascript-closures-work do JavaScript closures work Like the old Albert Einstein said.. said If you can't explain it to a six year old you really don't understand it yourself. Well I tried to explain JavaScript.. make up closures e.g. functions variables and the like but does not understand closures themselves EDIT I have seen the Scheme..
Access / process (nested) objects, arrays or JSON http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json the properties . Properties can be accessed either using dot notation var value obj.someProperty or bracket notation if.. Such structures can be accessed by consecutively applying dot or bracket notation. Here is an example var data code 42 items.. to access the name of the second item. Here is how we can do it step by step As we can see data is an object hence we can..
event.preventDefault() vs. return false http://stackoverflow.com/questions/1357118/event-preventdefault-vs-return-false method. Perhaps there are some reasons why I should avoid doing it like this and use preventDefault instead What's the better.. prevent the event from bubbling up and return false will do both. Note that this behaviour differs from normal non jQuery.. non jQuery event handlers in which notably return false does not stop the event from bubbling up . Source John Resig http..
Does it matter which equals operator (== vs ===) I use in JavaScript comparisons? http://stackoverflow.com/questions/359494/does-it-matter-which-equals-operator-vs-i-use-in-javascript-comparisons to replace two equals signs with three equals signs when doing things like comparing idSele_UNVEHtype.value.length 0 inside.. to the equality operator except no type conversion is done and the types must be the same to be considered equal. Reference.. Operators The operator will compare for equality after doing any necessary type conversions . The operator will not do..
Why is using “for…in” with array iteration such a bad idea? http://stackoverflow.com/questions/500504/why-is-using-for-in-with-array-iteration-such-a-bad-idea ignores 0 4 Also consider that JavaScript libraries might do things like this which will affect any array you create Somewhere.. 1 Now you have no idea what the below code will do. var a 1 2 3 4 5 for var x in a Now foo is a part of EVERY array..
http://stackoverflow.com/questions/5874652/prop-vs-attr .click function instead of this.getAttribute 'style' do i use this .prop 'style' or this .attr 'style' or in this case.. this .prop 'style' or this .attr 'style' or in this case do they do the same thing And if I do have to switch to using prop.. 'style' or this .attr 'style' or in this case do they do the same thing And if I do have to switch to using prop all..
Javascript closure inside loops - simple practical example http://stackoverflow.com/questions/750486/javascript-closure-inside-loops-simple-practical-example lot for me and I'm always left scratching my head what to do. var funcs for var i 0 i 3 i let's create 3 functions funcs.. same variable outside of the function. What you want to do is bind the variable within each function to a separate unchanging..
How can I get query string values in JavaScript? http://stackoverflow.com/questions/901115/how-can-i-get-query-string-values-in-javascript or without If so how If not is there a plugin which can do so javascript jquery url plugins query string share improve.. plugins query string share improve this question You don't need jQuery for that purpose. You can use vanilla JavaScript..
Sorting objects in an array by a field value in JavaScript http://stackoverflow.com/questions/1129216/sorting-objects-in-an-array-by-a-field-value-in-javascript a b but that only seems to work on strings and numbers. Do I need to add a toString method to my objects javascript sorting..
What does “use strict” do in JavaScript, and what is the reasoning behind it? http://stackoverflow.com/questions/1335851/what-does-use-strict-do-in-javascript-and-what-is-the-reasoning-behind-it at line 1 character 1 Missing use strict statement. Doing some searching I realized that some people add use strict.. all about what does it imply and is it still relevant Do any of the current browsers respond to the use strict string..
Javascript: Do I need to put this.var for every variable in an object? http://stackoverflow.com/questions/13418669/javascript-do-i-need-to-put-this-var-for-every-variable-in-an-object Do I need to put this.var for every variable in an object In C..
http://stackoverflow.com/questions/1631959/browser-window-close-event jQuery window .bind beforeunload function return confirm Do you really want to close But it works on form submission as..
How to fix Array indexOf() in JavaScript for IE browsers http://stackoverflow.com/questions/1744310/how-to-fix-array-indexof-in-javascript-for-ie-browsers explorer 8 cross browser share improve this question Do it like this... if Array.prototype.indexOf As recommended compatibility..
Why does everyone like jQuery more than prototype/script.aculo.us or MooTools or whatever? [closed] http://stackoverflow.com/questions/176324/why-does-everyone-like-jquery-more-than-prototype-script-aculo-us-or-mootools-or where I can find practically anything I should ever need. Do yourself a favour and definitely use jQuery... and donate some..
How to access PHP variables in JavaScript or jQuery rather than <?php echo $variable ?> http://stackoverflow.com/questions/1808108/how-to-access-php-variables-in-javascript-or-jquery-rather-than-php-echo-vari How do I access PHP variables in JavaScript or jQuery Do I have to write php echo variable1 php echo variable2 php echo.. for any manipulation or won't even get accepted saved. Don't use them for this type of interaction. jQuery.ajax is a good..
Preserving a reference to “this” in JavaScript prototype functions http://stackoverflow.com/questions/2025789/preserving-a-reference-to-this-in-javascript-prototype-functions I have a whole bunch of prototype functions on MyClass Do I have to save the reference to this at the beginning of each..
Do HTML5 custom data attributes ?śwork??in IE 6? http://stackoverflow.com/questions/2412947/do-html5-custom-data-attributes-work-in-ie-6 HTML5 custom data attributes śwork in IE 6 Custom data attributes..
http://stackoverflow.com/questions/242841/javascript-for-in-vs-for for&hellip in vs for Do you think there is a big difference in for...in and for loops..
Elements order in a “for (??in ??” loop http://stackoverflow.com/questions/280713/elements-order-in-a-for-in-loop order in a &ldquo for in &rdquo loop Does the for ¦in loop in Javascript loop through the hashtables.. important than the fact that this may change at any time. Do not rely on things staying this way. In short Use an array if..
Loop through array in JavaScript http://stackoverflow.com/questions/3010840/loop-through-array-in-javascript myStringArray Hello World for String s myStringArray Do something Can you do the same in JavaScript javascript arrays.. for var i 0 i myStringArray.length i alert myStringArray i Do something @zipcodeman suggests the use of the for...in statement..
jQuery/Javascript collision detection http://stackoverflow.com/questions/4230029/jquery-javascript-collision-detection late What would be the best way to go about this Do I need to use a library or is there simple enough code that..
Getting a better understanding of callback functions in JavaScript http://stackoverflow.com/questions/483073/getting-a-better-understanding-of-callback-functions-in-javascript myFirstFunction function param1 param2 callback Do something with param1 and param2. if arguments.length 3 Execute..
http://stackoverflow.com/questions/500431/javascript-variable-scope Scope What is the scope of variables in javascript Do they have the same scope inside as opposed to outside a function..
Using Rails 3.1, where do you put your “page specific” javascript code? http://stackoverflow.com/questions/6167805/using-rails-3-1-where-do-you-put-your-page-specific-javascript-code am a little concerned about page specific javascript code. Does this code get executed on every page The last thing I want.. a method that executes the javascript code for the page Do you no longer need require.js then Thanks EDIT I appreciate..
http://stackoverflow.com/questions/6348494/addeventlistener-vs-onclick is a matter of browser compatibility and necessity. Do you currently need to attach more than one event to an element.. and ready to rock element .on 'click' function do stuff Don't run out and get a framework just for this one thing though... would not work in IE versions less than 9. Documentation and Related Reading W3 HTML specification element..
Graph visualization code in JavaScript? http://stackoverflow.com/questions/7034/graph-visualization-code-in-javascript and I want to render that dynamically on an HTML page. Does anyone know of any JavaScript code that can do a reasonable.. node oriented visualizations already built there anyway. Do you know that one exists javascript jquery data structures..
YouTube iframe API: how do I control a iframe player that's already in the HTML? http://stackoverflow.com/questions/7443578/youtube-iframe-api-how-do-i-control-a-iframe-player-thats-already-in-the-html playVideo Possible questions answers Q It doesn't work A Doesn't work is not a clear description. Do you get any error messages.. It doesn't work A Doesn't work is not a clear description. Do you get any error messages Please show the relevant code. Q..
How to use GM_xmlhttpRequest in Injected Code? http://stackoverflow.com/questions/11377191/how-to-use-gm-xmlhttprequest-in-injected-code injected parts. Use messaging polling and or a specific DOM node to communicate between the scopes. If you really must.. 'GET' url fetchURL onload function responseDetails DO ALL RESPONSE PROCESSING HERE... console.log GM_xmlhttpRequest..
Generate excel sheet from html tables using jquery http://stackoverflow.com/questions/15567086/generate-excel-sheet-from-html-tables-using-jquery Mozilla browser . My code needs ActiveXObject enabled . DO i need to do something extra to get it done . I created this..
how validate file size using HTML and Javascript on client side http://stackoverflow.com/questions/1832415/how-validate-file-size-using-html-and-javascript-on-client-side changed their API to this https developer.mozilla.org en DOM FileReader You can do it in firefox like so html form action.. or some other such rubbish. edit I found this here HOW TO DO THIS IN IE head script function getSize var myFSO new ActiveXObject..
How to detect IE 11 with javascript in Asp.net http://stackoverflow.com/questions/18871760/how-to-detect-ie-11-with-javascript-in-asp-net internet explorer 11 share improve this question DO NOT DO BROWSER DETECTION It will break and it will cause you.. explorer 11 share improve this question DO NOT DO BROWSER DETECTION It will break and it will cause you problems...
how do I access XHR responseBody (for binary data) from Javascript in IE? http://stackoverflow.com/questions/1919972/how-do-i-access-xhr-responsebody-for-binary-data-from-javascript-in-ie method from Javascript. See jsdap for one example. EDIT DO NOT USE THIS VBScript var IE_HACK msie i.test navigator.userAgent.. very efficient. There is also a possible technique using ADODB.Stream which is a COM equivalent of a MemoryStream. See here.. to shift_jis encoded string var stream new ActiveXObject ADODB.Stream stream.Type 1 adTypeBinary stream.Open stream.Write..
http://stackoverflow.com/questions/2067472/what-is-jsonp-all-about is ignored but under normal circumstances you can't really DO anything with the results the script just gets evaluated. Enter..
Get Locale Short Date Format using javascript http://stackoverflow.com/questions/2388115/get-locale-short-date-format-using-javascript yyyy fr MC dd MM yyyy ar TN dd MM yyyy en ZA yyyy MM dd es DO dd MM yyyy ar OM dd MM yyyy en JM dd MM yyyy es VE dd MM yyyy..
Javascript in the address bar - is this malicious? http://stackoverflow.com/questions/2634159/javascript-in-the-address-bar-is-this-malicious What does it do How does it work Here's the source code DO NOT DO THIS Javascript var a x69 x6E x6E x65 x72 x48 x54 x4D.. does it do How does it work Here's the source code DO NOT DO THIS Javascript var a x69 x6E x6E x65 x72 x48 x54 x4D x4C x61..
How to determine if variable is 'undefined' or 'null' http://stackoverflow.com/questions/2647867/how-to-determine-if-variable-is-undefined-or-null names div#name .attr 'class' if EmpName 'undefined' DO SOMETHING javascript jquery variables null undefined share..
How to detect escape key press with JavaScript? [duplicate] http://stackoverflow.com/questions/3369593/how-to-detect-escape-key-press-with-javascript this question document .keyup function e if e.keyCode 27 DO YOUR WORK HERE esc http stackoverflow.com questions 1160008..
May function declarations appear inside statements in JavaScript? http://stackoverflow.com/questions/4071292/may-function-declarations-appear-inside-statements-in-javascript statement Nonstandard syntax found in GMail source code. DO NOT USE. try FunctionDeclaration not allowed in Block. function..
preload with percentage - javascript/jquery http://stackoverflow.com/questions/4999703/preload-with-percentage-javascript-jquery params ....... success function msg #wrapper .html msg DO NEEDFUL WITH THE RETURNED VALUE EDIT Using queryLoader script..
Restricting eval() to a narrow scope http://stackoverflow.com/questions/543533/restricting-eval-to-a-narrow-scope in which it is executed. If you don't trust the code DO NOT eval it or pass it to new Function or use it in any other..
Read a file one line at a time in node.js? http://stackoverflow.com/questions/6156501/read-a-file-one-line-at-a-time-in-node-js '0666' Process function Process err fd if err throw err DO lazy read but it's not working. I know that in a pinch I could..
On - window.location.hash - change? http://stackoverflow.com/questions/680785/on-window-location-hash-change need to even worry about hashchange support however you DO need to do some magic in form of a somewhat lesser known jQuery..
How do I disable right click on my web page? http://stackoverflow.com/questions/737022/how-do-i-disable-right-click-on-my-web-page body oncontextmenu return false ... body That being said DON'T DO IT. Why Because it achieves nothing other than annoying.. oncontextmenu return false ... body That being said DON'T DO IT. Why Because it achieves nothing other than annoying users...
Autocomplete combobox with Knockout JS template / JQuery http://stackoverflow.com/questions/7537002/autocomplete-combobox-with-knockout-js-template-jquery currentResponse null handle the choices being updated in a DO to decouple value updates from source options updates var mappedSource..
HTML5 Canvas Performance and Optimization Tips, Tricks and Coding Best Practices http://stackoverflow.com/questions/8205828/html5-canvas-performance-and-optimization-tips-tricks-and-coding-best-practices and Optimization Tips Tricks and Coding Best Practices DO YOU KNOW SOME MORE BEST PRACTICES FOR CANVAS Please add to this.. The 2d context has a back reference to it's associated DOM element var ctx doc.getElementById 'canvas' .getContext '2d'..
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